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# Montelukast/Levocetirizine
## Overview
Montelukast/levocetirizine is a combination product containing a leukotriene receptor antagonist and a second-generation antihistamine.
## Primary Indications
* Allergic rhinitis
* Chronic idiopathic urticaria
## Adult Dosing
The standard dose is montelukast 10 mg orally once daily plus levocetirizine 5 mg orally once daily. Maximum daily dose is montelukast 10 mg and levocetirizine 5 mg.
## Pediatric Dosing
Dosing varies by age and weight. Local protocols should be consulted.
* Patients 6 to 11 years: montelukast 5 mg orally once daily plus levocetirizine 2.5 mg orally once daily.
* Patients 6 months to 5 years: montelukast 4 mg orally once daily plus levocetirizine 1.25 mg orally once daily.
## Dose Adjustments
* **Renal Impairment:** No dose adjustment needed for montelukast. For levocetirizine, reduce dose by half in moderate to severe renal impairment (CrCl < 50 mL/min).
* **Hepatic Impairment:** No dose adjustment needed for montelukast or levocetirizine.
## Contraindications
* Hypersensitivity to montelukast, levocetirizine, or other piperazine derivatives.
* Severe hepatic impairment (for levocetirizine component).
## Adverse Effects
Common adverse effects include somnolence, fatigue, dizziness, headache, dry mouth, nausea, and pharyngitis.
Neuropsychiatric events have been reported with montelukast, including suicidal ideation, depression, and behavioral changes.
## Key Drug Interactions
* Theophylline: Montelukast may decrease theophylline plasma concentrations.
* CNS Depressants (e.g., sedatives, hypnotics, opioids, benzodiazepines, alcohol): Increased risk of somnolence and impaired performance with levocetirizine.
* CYP1A2 Inhibitors: May increase montelukast concentrations (e.g., fluvoxamine, cimetidine).
## Monitoring
* Monitor for neuropsychiatric adverse effects.
* Assess for efficacy in symptom control.
## Clinical Pearls
* Administer montelukast in the evening, regardless of mealtime. Levocetirizine may cause somnolence, so evening administration might be preferred.
* Montelukast should not be used as a rescue therapy for bronchospasm.
* Discontinue levocetirizine if symptoms of urinary retention develop.
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**Disclaimer:** This information is intended for healthcare professionals and does not substitute for professional medical advice. Always consult the most current prescribing information and relevant clinical guidelines before making any treatment decisions.
